it warns us when somebody's not trustworthy or trying to rip us off. you can feel it. but researchers say we get less skeptical as we get older. here's the bad news: it starts in your mid-50s. as we get older we lose the ability to determine who or what is untrustworthy. shelley taylor, the lead researcher says people basically as they age lose that gut feeling that, hey, something's wrong here. >> stephen: who who'd have thought that elderly fox news viewers would be more susceptible to misinformation. (cheers and applause) now, folks, my 50s are years and two years away. (laughter) but i want to protect myself against becoming gullible. fortunately a man on t.v. is selling me a miracle cure that will keep me young forever! it's called "andro gel and it's for treating something called low "t," a pharmaceutical company recognizing millions of men with low testosterone previously known as getting older. (laughter) this testosterone supplement was originally available in the near 1% concentration, or as i call it, man milk skim. (laughter) but last night when i was watch